Load hoisting tong



April 25, 1944. L, NELSON LOAD HOISTING TONG Filed May 11, 1943 PatentedApr. 25, 1944 UNITED STATES PATENT OFFICE LOAD HOISTING TONG Lee Nelson,Texas City, Tex.

Application May 11, 1943, Serial No. 486,591

2 Claims.

This invention relates to a load hoisting tong.

An object of the invention is to provide a tong of the characterdescribed specially designed for lifting heavy metal plates, beams andthe like.

Another object is to provide a tong having spaced fixed clamp jawsprovided with hearing faces on which are mounted wedge shaped slips forengaging the load with a lifting device for the tong which is operableagainst the slips to force them into secure engagement with the load.

With the above and other objects in view the invention has particularrelation to certain novel features of construction, operation andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawing wherein:

Figure 1 shows a side view of the tong in engagement with the load.

Figure 2 shows an edge view.

Figure 3 shows a fragmentary, cross-sectional view taken on the line 3-3of Figure 1.

Figure 4 shows an end view and Figure 5 shows a fragmentarycross-sectional view taken on the line 5-5 of Figure 1.

Referring now more particularly to the drawing wherein like numerals ofreference designate the same parts in each of the figures, the numeral ldesignates the body as a whole having the integral clamp jaws 2, 2provided with bearing faces 3, 3 which are spaced apart and whichconverge toward their free ends. Mounted on the faces are the wedgeshaped slips 4, 4 which have a sliding, dove-tailed connection with thejaws 2. These slips are retained against detachment by means of the setscrews 5 which are threaded through the jaws 2 and whose inner endsproject into the longitudinal grooves 6 in the outer sides of the slips4. The slips have the inside teeth I to engage the plate 8 or other loadto be handled.

The body I has opposing slots, as 9, 9 out therethrough which areseparated by the space block ID, secured in the body between them.

There are the lifting links H, l I fitted through the respective slotsand pivoted to the body. The outer ends of these links are connected bythe linkage l2, 13 to the lifting cable l4.

The inner ends of the links H are formed with cams I5, I5 which bearagainst the opposing ends of the slips 4, 4,

The links H, II are arcuate so that when the load is inserted betweenthe slips and the tong is elevated the cams will force the slipsdownwardly along the bearing faces 3, 3 and into secure engagement withthe load so that the load will be very securely held against droppingout thus reducing the liability of accidents from the falling of theload,

The weight of the load will be transmitted through the slips 4, thebolts l6 on which the links H are pivoted and on to the cable It thusrelieving the clamp jaws 2 thus making it possible to form the body I oflighter construction.

The drawing and description are illustrative merely while the broadprinciple of the invention will be defined by the appended claims.

What I claim is:

1. A lifting tong comprising fixed clamp jaws spaced apart and havingbearing faces which converge toward their free ends, wedge shapedgripping jaws mounted to slide on said faces to grip a load betweenthem, a single link on each side pivoted to the fixed jaws and whoseinner ends bear against the wide ends of the gripping jaws and liftingmeans connect the other ends of said links.

2. A lifting tong comprising a body having integral clamp jaws providedwith bearing faces which are spaced apart and which converge towardtheir free ends said body having side slots, wedge shaped slips forminggrip jaws mounted to slide on said faces to grip a load between them,arcuate links pivoted on the body whose inner ends project through saidslots and form cams which bear against the wide ends of the slips, theother ends of saidlinks projecting beyond body and lifting meansconnecting said other ends whereby upon lifting movement said cams willact against the slips to hold them in secure engagement with the load.

LEE NELSON.

